Do we need a `VisitiationFrequency`?

[Datseris]

I'm a bit unhappy that we need to do the complicated VisitationFrequency(RectangularBinning(n)). I understand that VisitationFrequency could take other things than RectangularBinning, but I don't understand where else RectangularBinning can be given to except VisitationFrequency. Why don't we allow RectangularBinning itself to be used directly with probabilities? @kahaaga

[kahaaga]

RectangularBinning is used both with VisitationFrequency and TransferOperator - that's why I didn't make RectangularBinning itself an estimator.

There will be two types of binnings: RectangularBinning and TriangularBinning (#55, which I have to finish after a loong hiatus). Both can be inputs to both VisitationFrequency and TransferOperator.

I do agree, however, that it would be convenient to just pass RectangularBinning directly to probabilities. We could just mention in the docstring that this is just a convenience call to VisitationFrequency.

On the same note, I think I'd like shorter names. What do you think about RectangularBinning → Grid and TriangulationBinning → Triangulation?

[kahaaga]

Why don't we allow RectangularBinning itself to be used directly with probabilities? @kahaaga

I guess we can close this, since we agreed in #127 that probabilities should only accept a ProbabilityEstimator?